Which situation would be most likely to form a fossil under normal environmental conditions?
A. A jellyfish that died in an estuary.
B. A slug that died in leaf litter.
C. A bird that died and fell to the forest floor.
D. An elephant that died at the edge of a waterhole.
Answer: D
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How many additional electrons will chlorine need to obtain in order to have a complete outer orbital shell?
a. 2 b. 4 c. 1 d. 5 e. 3
Now that the human genome has been sequenced, we know that there are fewer than expected protein
coding genes (approximately 20,000). Yet, the total number of proteins produced in humans approaches 100,000. What accounts for this discrepancy in numbers?
a. We have not yet identified all of the open reading frames in the human genome. b. We have not yet fully sequenced the human genome. c. The various mechanisms of mRNA processing lead to more proteins being produced than the DNA directly encodes. d. Some proteins are converted into completely new proteins after translation. e. There has been a gross over-estimation of the number of proteins produced in humans.
The digestion of proteins begins in the
a. stomach. b. pancreas. c. small intestine. d. large intestine. e. esophagus.
Which of the following statements about genes is incorrect?
A) Genes correspond to segments of DNA. B) Many genes contain the information needed for cells to synthesize enzymes and other proteins. C) During fertilization, both the sperm and the ovum contribute genes to the resulting fertilized egg. D) Under normal circumstances, each chromosome contains precisely one gene. E) Genetic differences can result from changes in the DNA called mutations